The World from PRX

Ultramarathon

Runners pass by a large video screen commemorating the 70th anniversary of the founding of Communist China during the Beijing Marathon in Beijing, Nov. 3, 2019.
Sports
China’s ultramarathoners sound alarm on lack of safety precautions at races 
Competitors run in the 2013 Badwater Ultramarathon in Death Valley National Park, California. The 135-mile (217 km) race, which bills itself as the world's toughest foot race, goes from Death Valley to Mt. Whitney, California. Temperatures can reach 130 d
Science
Ultrarunning tests the outer boundaries of human endurance, but doctors say it’s still safe